【作者】 杨雪；

【导师】 邵忠宝；

【作者基本信息】 东北大学 ， 物理化学， 2008， 硕士

【摘要】 以Ce(NO3)3·6H2O、Mg(NO3)2·6H2O、Al(NO3)3·6H2O为原料,NH3·H2O为沉淀剂,用化学沉淀法制备前驱体,1300℃保温1h,即得到平均粒径为38nm的球状CeMgAl11O19粉体,有效降低了烧结温度。用热重-差热分析(TG-DTA)、X射线衍射(XRD)、透射电镜(TEM)和激光粒度分析(LPA)等检测方法对粉体的性能进行了表征。以CeO2、MgO、Al2O3为原料,用高温球磨法在1100℃制备CeMgAl11O19粉体,得到平均粒径为80 nm的球状CeMgAl11O19荧光粉。本文对高温球磨法、稀土发光材料的制备及性质方面的研究作了阐述。针对传统制备方法的局限性,将化学沉淀法与高温球磨法结合起来,通过制备前驱体和球磨热分解前驱体两个步骤,获得了CeMgAl11O19稀土发光材料。以Ce(NO3)3·6H2O、Mg(NO3)2·6H2O、Al(NO3)3·6H2O为原料,NH3·H2O为沉淀剂用化学沉淀法制备出前驱体,用高温球磨机进行高温球磨,在900℃下球磨1h,得到平均粒径为53nm的球状CeMgAl11O19荧光粉。可以看出,此方法进一步降低了烧结温度,得到了颗粒平均粒径小,分散均匀的CeMgAl11O19粉体。本文采用高温球磨法制备稀土发光材料,开辟了稀土发光材料新的制备方法。更多还原

【Abstract】 Ce(NO3)3·6H2O, Mg(NO3)2·6H2O, Al(NO3)3·6H2O were used as raw materials and NH3·H2O as precipitant, the chemical precipitation method was used to produce precursos. The spheric CeMgAl11O19 powder was obtained with heat preservation for an hour at 1300℃and the averaged particle size was about 38 nm. Sintering temperature was decreased effectively. The powder was characterized by the methods of thermogravimetric-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and laser particle analysis (LPA).With CeO2、MgO、Al2O3 as raw materials, the spheric CeMgAl11O19 phosphor is produced by the high temperature ball milling method at 1100℃and the averaged particle size is about 80 nm. The preparation and properties of rare earth phosphors and high temperature ball milling method were also reviewed. Against limitations of conventional preparing methods, this work united the chemical precipitation methods with high temperature ball milling methods by means of two steps method of preparing precursos and ball milling thermal decomposition. Then, the CeMgAl11O19 rare earth green phosphors were obtained.With Ce(NO3)3·6H2O, Mg(NO3)2·6H2O, Al(NO3)3·6H2O as raw materials and NH3·H2O as precipitant. The chemical precipitation method was used to produce precursos. The spheric CeMgAl11O19 powder was obtained by the high temperature ball milling for an hour at 900℃the averaged particle size was about 53 nm. It can be seen that the sintering temperature was decreased with this method and the CeMgAl11O19 powder with minor diameter and uniform dispersion was obtained.Through the present study of using high temperature ball milling to prepare rare earth phosphors in this thesis, the method or measure about the research of rare earth phosphors was developed.更多还原